System Unit III – Parts of CPU


Welcome to class! 

In our last lesson, we learned about the computer system and its different parts. Today, we are going to dive deeper into the central part of the computer, which is the CPU.

System Unit III – Parts of CPU

What is the CPU?

System Unit III - Parts of CPU

The CPU stands for “Central Processing Unit.”

Think of it as the brain of the computer. It does all the thinking and processing.

Parts of the CPU

Control Unit (CU)

System Unit III - Parts of CPU

It manages and coordinates all the activities inside the CPU.

It tells other parts of the CPU what to do.

Arithmetic Logic Unit (ALU)

This is where all the mathematical and logical calculations happen.

It can add, subtract, multiply, and compare numbers.


Registers are like small storage spaces in the CPU.

They store data and instructions that the CPU needs to work on.

Cache Memory

Cache memory is a small but very fast memory inside the CPU.

It stores frequently used data to speed up processing.


The CPU has a clock that keeps everything in sync.

It helps control the speed of the CPU.

Heat Sink

The CPU can get very hot when it works.

The heat sink keeps it cool to prevent overheating.

The CPU works by receiving instructions, processing data, and sending results.

In this lesson, we learned about the CPU, which is like the brain of the computer.

We explored its different parts, such as the Control Unit, Arithmetic Logic Unit, Registers, Cache Memory, Clock, and Heat Sink.

The CPU is crucial for all the calculations and tasks a computer performs.

Next time, we’ll learn more about how the CPU works with other parts of the computer.

Remember, understanding the CPU is a fundamental concept in computer science. If you have any questions, feel free to ask in the comment section below.

We have come to the end of today’s class. I hope you enjoyed the class!

In the next class, we shall be discussing Functions of CPU.

In case you require further assistance or have any questions, feel free to ask in the comment section below, and trust us to respond as soon as possible. Cheers!

Question Time

  1. What does CPU stand for, and what is its role in a computer?
  2. Name three important parts of the CPU and describe what each of them does.
  3. Why is the Control Unit important in the CPU, and what is its main function?
  4. Explain the role of the Arithmetic Logic Unit (ALU) in the CPU.
  5. What is the purpose of registers in the CPU, and why are they necessary?
  6. Why is cache memory important in a CPU, and how does it speed up processing?
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